https://github.com/HainaLi/horcrux_password_manager
It is in JS at least. Underhanded C is likely an easier trick to manage.
Basically, the story was that a program for grad research was inserting all kinds of nasty, anti-semetic things into text and it turned out the previous grad student had poisoned the compiler which was modifying the strings and was able to re-poison it every time through something else.
I forgot the exact details but it is an amazing read.
Then they aren't paranoid but normal folks, eh?
Idk about other people but I find anything I don't find security holes in myself "as good" as anything I've written. I've got the same set of assumptions/blinders/competence either way.